LM555 - LM555 Timer February 2000 LM555 Timer General...

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LM555 Timer General Description The LM555 is a highly stable device for generating accurate time delays or oscillation. Additional terminals are provided for triggering or resetting if desired. In the time delay mode of operation, the time is precisely controlled by one external re- sistor and capacitor. For astable operation as an oscillator, the free running frequency and duty cycle are accurately controlled with two external resistors and one capacitor. The circuit may be triggered and reset on falling waveforms, and the output circuit can source or sink up to 200mA or drive TTL circuits. Features n Direct replacement for SE555/NE555 n Timing from microseconds through hours n Operates in both astable and monostable modes n Adjustable duty cycle n Output can source or sink 200 mA n Output and supply TTL compatible n Temperature stability better than 0.005% per ˚C n Normally on and normally off output n Available in 8-pin MSOP package Applications n Precision timing n Pulse generation n Sequential timing n Time delay generation n Pulse width modulation n Pulse position modulation n Linear ramp generator Schematic Diagram DS007851-1 February 2000 LM555 Timer © 2000 National Semiconductor Corporation DS007851 www.national.com
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Connection Diagram Ordering Information Package Part Number Package Marking Media Transport NSC Drawing 8-Pin SOIC LM555CM LM555CM Rails M08A LM555CMX LM555CM 2.5k Units Tape and Reel 8-Pin MSOP LM555CMM Z55 1k Units Tape and Reel MUA08A LM555CMMX Z55 3.5k Units Tape and Reel 8-Pin MDIP LM555CN LM555CN Rails N08E Dual-In-Line, Small Outline and Molded Mini Small Outline Packages DS007851-3 Top View LM555 www.national.com 2
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Absolute Maximum Ratings (Note 2) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage +18V Power Dissipation (Note 3) LM555CM, LM555CN 1180 mW LM555CMM 613 mW Operating Temperature Ranges LM555C 0˚C to +70˚C Storage Temperature Range -65˚C to +150˚C Soldering Information Dual-In-Line Package Soldering (10 Seconds) 260˚C Small Outline Packages (SOIC and MSOP) Vapor Phase (60 Seconds) 215˚C Infrared (15 Seconds) 220˚C See AN-450 “Surface Mounting Methods and Their Effect on Product Reliability” for other methods of soldering surface mount devices. Electrical Characteristics (Notes 1, 2) (T A = 25˚C, V CC = +5V to +15V, unless othewise specified) Parameter Conditions Limits Units LM555C Min Typ Max Supply Voltage 4.5 16 V Supply Current V CC = 5V, R L = V CC = 15V, R L = (Low State) (Note 4) 3 10 6 15 mA Timing Error, Monostable Initial Accuracy 1% Drift with Temperature R A = 1k to 100k , 50 ppm/˚C C = 0.1μF, (Note 5) Accuracy over Temperature 1.5 % Drift with Supply 0.1 %/V Timing Error, Astable Initial Accuracy 2.25 % Drift with Temperature R A ,R B = 1k to 100k , 150 ppm/˚C C = 0.1μF, (Note 5) Accuracy over Temperature 3.0 % Drift with Supply 0.30 %/V Threshold Voltage 0.667 x V CC Trigger Voltage V CC = 15V 5 V V CC = 5V 1.67 V Trigger Current 0.5 0.9 μA Reset Voltage 0.4 0.5 1 V Reset Current 0.1 0.4 mA Threshold Current (Note 6) 0.1 0.25 μA Control Voltage Level V CC = 15V V CC =5V 9 2.6 10 3.33 11 4 V
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This note was uploaded on 09/25/2011 for the course ECEL 304 taught by Professor Fontecchio during the Winter '07 term at Drexel.

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LM555 - LM555 Timer February 2000 LM555 Timer General...

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